A medic who may have to deal with a heavy and/or out of control patient will do it much easier if he is big.
That was my thought. LOL, having had some personal experience in this type of thing, they always called on me when they wanted someone who could catch a patient if they went down. Granted, I am nowhere near the size of that guy, but when everyone you work with is about 60 lbs lighter and four inches shorter, you get the short straw!
(I always thought “Man, if I DO have to catch them, all I am going to be is a mattress to break their fall!”